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Conference Paper


Moving Bits by Air, Land and Sea-Carriers, Vans and Packets


In the past, the data network designer was confronted with only a few choices relative to communications service alternatives and line tariffs. Basically, he had to choose between dial-up or private line from terminal to computer and, in the case of private line, between narrowband or voice grade. After this preliminary choice was made, the network was optimized based on a well denned line cost structure. Recently, the need for high bandwidth and high quality computer to computer communications, and the emergence of new communications services both from conventional common carriers and from specialized carriers has created new requirements and new line alternatives for the data network user, thus adding a new, important dimension to network design. Line economy, service quality, network growth flexibility and value added services are among the considerations that should guide the user in the selection between such alternatives. In this paper, we attempt to identify the impact of the new offerings on the ^optimal network strategy, in a typical data communications environment. The important aspects of the various alternatives are briefly outlined and compared, and some technical details on the operation of the new value added networks are presented. General guidelines for the selection of the best alternative are provided, and are illustrated in two applications.

Paper: PDF file of paper

Information & Date

In AFIPS Conference Proceedings, Vol. 44, , Anaheim, USA, May. 1975


Mario Gerla
John Eckl